Why is it undesirable to land off the end of a runway?

Landing off the end of a runway is particularly undesirable due to the presence of approaching and departing aircraft. Airports are active environments where aircraft are constantly taking off and landing, especially near runways. If a parachutist were to land in this area, the risks of a collision with an aircraft are significantly heightened. Aircraft in this vicinity may not be aware of another object in the airspace, such as a parachutist, leading to potentially catastrophic outcomes.

Safety protocols in skydiving emphasize the importance of having a clear and designated landing area, which is typically far away from airport operational areas. By ensuring a safe distance from runways, parachutists reduce the risk of interference with air traffic and ensure the safety of all involved.

The other options touch on valid safety concerns, such as wind conditions and visibility, as well as the lack of designated emergency landing areas. However, these factors are secondary to the immediate and critical concern of potential collisions with airborne aircraft, which poses the greatest danger.